1002001000191 has 8 divisors (see below), whose sum is σ = 1336074744624. Its totient is φ = 667963961280.

The previous prime is 1002001000177. The next prime is 1002001000237. The reversal of 1002001000191 is 1910001002001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1002001000191 - 2⁵ = 1002001000159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1002001000191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002001000111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9112620 + ... + 9221921.

It is an arithmetic number, because the mean of its divisors is an integer number (167009343078).

Almost surely, 2^{1002001000191} is an apocalyptic number.

1002001000191 is a deficient number, since it is larger than the sum of its proper divisors (334073744433).

1002001000191 is a wasteful number, since it uses less digits than its factorization.

1002001000191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18352761.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 1002001000191 its reverse (1910001002001), we get a palindrome (2912002002192).

The spelling of 1002001000191 in words is "one trillion, two billion, one million, one hundred ninety-one", and thus it is an aban number.